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Derivative Financial Instruments (Aggregate Outstanding Notionals) (Details) lb in Millions, bu in Millions, $ in Millions	Mar. 31, 2018 USD ($) bu lb T	Sep. 30, 2017 USD ($) bu lb T
Corn (in bushels)
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | bu	79	55
Soy Meal (in tons)
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount | T	278,600	475,200
Live Cattle [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	124	211
Lean Hogs [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount	37	240
Foreign Currency [Member]
Derivative [Line Items]
Derivative, Notional Amount | $	$ 74	$ 58

X

- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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Namespace Prefix:	invest_
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Balance Type:	na
Period Type:	instant

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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